ObjFW  Diff

			return OF_ORDERED_DESCENDING;
		if (tolower((int)first[i]) < tolower((int)second[i]))
			return OF_ORDERED_ASCENDING;
	}

	return OF_ORDERED_SAME;
}

int
of_string_utf8_check(const char *UTF8String, size_t UTF8Length, size_t *length)
{
	size_t i, tmpLength = UTF8Length;
	int isUTF8 = 0;

	for (i = 0; i < UTF8Length; i++) {
		/* No sign of UTF-8 here */
		if OF_LIKELY (!(UTF8String[i] & 0x80))
			continue;

		isUTF8 = 1;

		/* We're missing a start byte here */
		if OF_UNLIKELY (!(UTF8String[i] & 0x40))
			return -1;

		/* 2 byte sequences for code points 0 - 127 are forbidden */
		if OF_UNLIKELY ((UTF8String[i] & 0x7E) == 0x40)
			return -1;

		/* We have at minimum a 2 byte character -> check next byte */
		if OF_UNLIKELY (UTF8Length <= i + 1 ||
		    (UTF8String[i + 1] & 0xC0) != 0x80)
			return -1;

		/* Check if we have at minimum a 3 byte character */
		if OF_LIKELY (!(UTF8String[i] & 0x20)) {
			i++;
			tmpLength--;
			continue;
		}

		/* We have at minimum a 3 byte char -> check second next byte */
		if OF_UNLIKELY (UTF8Length <= i + 2 ||
		    (UTF8String[i + 2] & 0xC0) != 0x80)
			return -1;

		/* Check if we have a 4 byte character */
		if OF_LIKELY (!(UTF8String[i] & 0x10)) {
			i += 2;
			tmpLength -= 2;
			continue;
		}

		/* We have a 4 byte character -> check third next byte */
		if OF_UNLIKELY (UTF8Length <= i + 3 ||
		    (UTF8String[i + 3] & 0xC0) != 0x80)
			return -1;

		/*
		 * Just in case, check if there's a 5th character, which is
		 * forbidden by UTF-8
		 */
		if OF_UNLIKELY (UTF8String[i] & 0x08)
			return -1;

		i += 3;
		tmpLength -= 3;
	}

	if (length != NULL)
		*length = tmpLength;

	return isUTF8;
}

size_t
of_string_utf8_encode(of_unichar_t character, char *buffer)
{
	size_t i = 0;

	if (character < 0x80) {
		buffer[i] = character;
		return 1;
	} else if (character < 0x800) {
		buffer[i++] = 0xC0 | (character >> 6);
		buffer[i] = 0x80 | (character & 0x3F);
		return 2;
	} else if (character < 0x10000) {
		buffer[i++] = 0xE0 | (character >> 12);
		buffer[i++] = 0x80 | (character >> 6 & 0x3F);
		buffer[i] = 0x80 | (character & 0x3F);
		return 3;
	} else if (character < 0x110000) {
		buffer[i++] = 0xF0 | (character >> 18);
		buffer[i++] = 0x80 | (character >> 12 & 0x3F);
		buffer[i++] = 0x80 | (character >> 6 & 0x3F);
		buffer[i] = 0x80 | (character & 0x3F);
		return 4;
	}

	return 0;
}

size_t
of_string_utf8_decode(const char *buffer_, size_t length, of_unichar_t *ret)
{
	const uint8_t *buffer = (const uint8_t*)buffer_;

	if (!(*buffer & 0x80)) {
		*ret = buffer[0];
		return 1;
	}

	if ((*buffer & 0xE0) == 0xC0) {
		if OF_UNLIKELY (length < 2)
			return 0;

		*ret = ((buffer[0] & 0x1F) << 6) | (buffer[1] & 0x3F);
		return 2;
	}

	if ((*buffer & 0xF0) == 0xE0) {
		if OF_UNLIKELY (length < 3)
			return 0;

		*ret = ((buffer[0] & 0x0F) << 12) | ((buffer[1] & 0x3F) << 6) |
		    (buffer[2] & 0x3F);
		return 3;
	}

	if ((*buffer & 0xF8) == 0xF0) {
		if OF_UNLIKELY (length < 4)
			return 0;

		*ret = ((buffer[0] & 0x07) << 18) | ((buffer[1] & 0x3F) << 12) |
		    ((buffer[2] & 0x3F) << 6) | (buffer[3] & 0x3F);
		return 4;
	}

	return 0;
}

size_t
of_string_utf8_get_index(const char *string, size_t position)
{
	size_t i, index = position;

	for (i = 0; i < position; i++)
		if OF_UNLIKELY ((string[i] & 0xC0) == 0x80)
			index--;

	return index;
}

size_t
of_string_utf8_get_position(const char *string, size_t index, size_t length)
{
	size_t i;

	for (i = 0; i <= index; i++)
		if OF_UNLIKELY ((string[i] & 0xC0) == 0x80)
			if (++index > length)
				return OF_INVALID_INDEX;

	return index;
}

@implementation OFString_UTF8
- init
{
	self = [super init];

	@try {

		}

		s = &s_store;

		s->cString = storage;
		s->cStringLength = UTF8StringLength;

		switch (of_string_utf8_check(UTF8String, UTF8StringLength,
		    &s->length)) {
		case 1:
			s->UTF8 = YES;
			break;
		case -1:
			@throw [OFInvalidEncodingException
			    exceptionWithClass: [self class]];

		s = &s_store;

		s->cString = [self allocMemoryWithSize: cStringLength + 1];
		s->cStringLength = cStringLength;

		if (encoding == OF_STRING_ENCODING_UTF_8 ||
		    encoding == OF_STRING_ENCODING_ASCII) {
			switch (of_string_utf8_check(cString, cStringLength,
			    &s->length)) {
			case 1:
				if (encoding == OF_STRING_ENCODING_ASCII)
					@throw [OFInvalidEncodingException
					    exceptionWithClass: [self class]];

				s->UTF8 = YES;

				if (!(cString[i] & 0x80)) {
					s->cString[j++] = cString[i];
					continue;
				}

				s->UTF8 = YES;
				bytes = of_string_utf8_encode(
				    (uint8_t)cString[i], buffer);

				if (bytes == 0)
					@throw [OFInvalidEncodingException
					    exceptionWithClass: [self class]];

				s->cStringLength += bytes - 1;

			character = table[(uint8_t)cString[i]];

			if (character == 0xFFFD)
				@throw [OFInvalidEncodingException
				    exceptionWithClass: [self class]];

			s->UTF8 = YES;
			characterBytes = of_string_utf8_encode(character,
			    buffer);

			if (characterBytes == 0)
				@throw [OFInvalidEncodingException
				    exceptionWithClass: [self class]];

			s->cStringLength += characterBytes - 1;

		}

		s = &s_store;

		s->cString = (char*)UTF8String;
		s->cStringLength = UTF8StringLength;

		switch (of_string_utf8_check(UTF8String, UTF8StringLength,
		    &s->length)) {
		case 1:
			s->UTF8 = YES;
			break;
		case -1:
			@throw [OFInvalidEncodingException
			    exceptionWithClass: [self class]];

		s->cStringLength = length;
		s->cString = [self allocMemoryWithSize: (length * 4) + 1];
		s->length = length;

		for (i = 0; i < length; i++) {
			char buffer[4];
			size_t characterLen = of_string_utf8_encode(
			    (swap ? of_bswap32(string[i]) : string[i]),
			    buffer);

			switch (characterLen) {
			case 1:
				s->cString[j++] = buffer[0];
				break;

				    (nextCharacter & 0x3FF)) + 0x10000;

				i++;
				s->cStringLength--;
				s->length--;
			}

			characterLen = of_string_utf8_encode(character, buffer);


			switch (characterLen) {
			case 1:
				s->cString[j++] = buffer[0];
				break;
			case 2:
				s->UTF8 = YES;

		    arguments)) == -1)
			@throw [OFInvalidFormatException
			    exceptionWithClass: [self class]];

		s->cStringLength = cStringLength;

		@try {
			switch (of_string_utf8_check(tmp, cStringLength,
			    &s->length)) {
			case 1:
				s->UTF8 = YES;
				break;
			case -1:
				@throw [OFInvalidEncodingException
				    exceptionWithClass: [self class]];

	i = j = 0;

	while (i < s->cStringLength && j < otherCStringLength) {
		of_unichar_t c1, c2;
		size_t l1, l2;

		l1 = of_string_utf8_decode(s->cString + i,
		    s->cStringLength - i, &c1);
		l2 = of_string_utf8_decode(otherCString + j,
		    otherCStringLength - j, &c2);

		if (l1 == 0 || l2 == 0 || c1 > 0x10FFFF || c2 > 0x10FFFF)
			@throw [OFInvalidEncodingException
			    exceptionWithClass: [self class]];

		if (c1 >> 8 < OF_UNICODE_CASEFOLDING_TABLE_SIZE) {

	OF_HASH_INIT(hash);

	for (i = 0; i < s->cStringLength; i++) {
		of_unichar_t c;
		size_t length;

		if ((length = of_string_utf8_decode(s->cString + i,
		    s->cStringLength - i, &c)) == 0)
			@throw [OFInvalidEncodingException
			    exceptionWithClass: [self class]];

		OF_HASH_ADD(hash, (c & 0xFF0000) >> 16);
		OF_HASH_ADD(hash, (c & 0x00FF00) >>  8);
		OF_HASH_ADD(hash,  c & 0x0000FF);

	if (index >= s->length)
		@throw [OFOutOfRangeException exceptionWithClass: [self class]];

	if (!s->UTF8)
		return s->cString[index];

	index = of_string_utf8_get_position(s->cString, index,
	    s->cStringLength);

	if (!of_string_utf8_decode(s->cString + index, s->cStringLength - index,
	    &character))
		@throw [OFInvalidEncodingException
		    exceptionWithClass: [self class]];

	return character;
}

- (void)getCharacters: (of_unichar_t*)buffer

	if (cStringLength > s->cStringLength)
		return of_range(OF_INVALID_INDEX, 0);

	if (options & OF_STRING_SEARCH_BACKWARDS) {
		for (i = s->cStringLength - cStringLength;; i--) {
			if (!memcmp(s->cString + i, cString, cStringLength))
				return of_range(
				    of_string_utf8_get_index(s->cString, i),
				    [string length]);

			/* Did not match and we're at the last char */
			if (i == 0)
				return of_range(OF_INVALID_INDEX, 0);
		}
	} else {
		for (i = 0; i <= s->cStringLength - cStringLength; i++)
			if (!memcmp(s->cString + i, cString, cStringLength))
				return of_range(
				    of_string_utf8_get_index(s->cString, i),
				    [string length]);
	}

	return of_range(OF_INVALID_INDEX, 0);
}

- (BOOL)containsString: (OFString*)string

	size_t start = range.start;
	size_t end = range.start + range.length;

	if (end > s->length)
		@throw [OFOutOfRangeException exceptionWithClass: [self class]];

	if (s->UTF8) {
		start = of_string_utf8_get_position(s->cString, start,
		    s->cStringLength);
		end = of_string_utf8_get_position(s->cString, end,
		    s->cStringLength);
	}

	return [OFString stringWithUTF8String: s->cString + start
				       length: end - start];
}

	i = 0;
	j = 0;

	while (i < s->cStringLength) {
		of_unichar_t c;
		size_t cLen;

		cLen = of_string_utf8_decode(s->cString + i,
		    s->cStringLength - i, &c);

		if (cLen == 0 || c > 0x10FFFF)
			@throw [OFInvalidEncodingException
			    exceptionWithClass: [self class]];

		ret[j++] = c;